Developer Debugs AI Agent That Wrote 70 Duplicate Paragraphs Due to Cache Bug

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A software engineer discovered that an AI runtime agent he built generated 70 identical paragraphs on a single draft article instead of just one. The root cause was not the AI model itself, but a 60-second read cache that repeatedly served stale data, making the system believe no paragraph had been written after each successful write. The agent's built-in verification rule — which required a read-back confirmation before marking a task complete — inadvertently amplified the bug by looping on false negatives. The engineer, who runs engineering at app platform GoodBarber and operates production AI agents, used the incident to develop a structured debugging framework for probabilistic systems. His framework prioritizes three questions in order: what the system was permitted to get wrong, which layer introduced the error, and how long the error persisted before detection.

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